If you need to see the other end of the a pipe, you can use either a find for the inode, or lsof, also on the inode.<\/p>\n
We see our process of interest is waiting on a read call from file descriptor 4…<\/p>\n
\r\n[root@cmhlpdlkedat01 ~]# strace -f -p 20352\r\nProcess 20352 attached - interrupt to quit\r\nread(4, ^C\r\nProcess 20352 detached\r\n<\/pre>\n …so we see it has the following inode…<\/p>\n
\r\n[root@cmhlpdlkedat01 ~]# ls -lrt \/proc\/20352\/fd | awk '$(NF - 2) == 4'\r\nlr-x------ 1 postgres postgres 64 Jul 3 11:08 4 -> pipe:[2789099945]\r\n<\/pre>\n…so we can either recursively search \/proc for the same inode…<\/p>\n
\r\n[root@cmhlpdlkedat01 ~]# (find \/proc -type l | xargs ls -l | fgrep 'pipe:[2789099945]') 2>\/dev\/null\r\nlr-x------ 1 postgres postgres 64 Jul 3 11:08 \/proc\/20352\/fd\/4 -> pipe:[2789099945]\r\nlr-x------ 1 postgres postgres 64 Jul 3 11:11 \/proc\/20352\/task\/20352\/fd\/4 -> pipe:[2789099945]\r\nl-wx------ 1 postgres postgres 64 Jul 3 11:08 \/proc\/20406\/fd\/1 -> pipe:[2789099945]\r\nl-wx------ 1 postgres postgres 64 Jul 3 11:11 \/proc\/20406\/task\/19955\/fd\/1 -> pipe:[2789099945]\r\nl-wx------ 1 postgres postgres 64 Jul 3 11:11 \/proc\/20406\/task\/20406\/fd\/1 -> pipe:[2789099945]\r\n<\/pre>\n…or use lsof…<\/p>\n
\r\n[root@cmhlpdlkedat01 ~]# lsof | grep 2789099945\r\nsetup.php 20352 postgres 4r FIFO 0,8 0t0 2789099945 pipe\r\nosm2pgsql 20406 postgres 1w FIFO 0,8 0t0 2789099945 pipe\r\n[root@cmhlpdlkedat01 ~]#\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"If you need to see the other end of the a pipe, you can use either a find for the inode, or lsof, also on the inode. We see our process of interest is waiting on a read call from…<\/p>\n